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Find Generator install pros in Holbrook

CPT Electric
5.0(
62
)
Fixed Generator - InstallPortable Generator - Install

Serving Holbrook, NY and surrounding areas

Approved

Super Service Award Winner

In business since 2020

Small jobs welcome

Customers say: Quality work

"New to the area, I needed a hookup for an emergency generator and EV charger. Cole came to my home, took the time to discuss different options and answer questions, and provided a detailed, written estimate, all the same day as my initial inquiry. The project was completed within a few days. His price was very competitive and his work meticulous. A true professional."
Response time9 hrs
Response rate93%
Recommended by79%of homeowners
Avatar for Morris Electric
Morris Electric
4.9(
30
)
Portable Generator - Install

Serving Holbrook, NY and surrounding areas

Approved

In business since 2000

Free estimates

Customers say: Quick response

"He made room in my electrical panel by installing double circuit-breakers to accommodate my home. Based on the work and how they presented themselves, I would recommend them. Very clean and professional, and I would hire them again in a heartbeat. Their price was reasonable, the work was great, and it was an overall pleasant experience."
Lake Ronkonkoma House
Lake Ronkonkoma House
200amp upgrade
200amp upgrade
200amp upgrade

+3

Response time2 hrs
5 neighbors recently requested a quote
Recommended by93%of homeowners
Wilburforce Electric LLC
5.0(
8
)
Portable Generator - Install

Serving Holbrook, NY and surrounding areas

Approved

In business since 2012

Free estimates

Credit card accepted

"They were extremely honest, courteous, need and fair. We had them install all of the electric for my pool equipment, lights etc. and run electric to the dock for boat power. They were so good, we had them come back and re run all the electrical in the downstairs of our house including new outlets, lights etc. we also had them upgrade our panel to a 200 amp. I can not say enough about how clean and easy they were to work withâ ¦.I would recommend them 100%!"
Response time3 hrs
Recommended by100%of homeowners
Avatar for A/C Performance Power, Inc.
A/C Performance Power, Inc.
5.0(
4
)
Generator - Repair - For Business

Serving Holbrook, NY and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"Jim, the Owner provided timely, Expert generator repair, to get a 15 year old 30KW generator that hadnâ  t run in years operational in 30 minutes. We were fortunate to find him, and appreciate his skill, integrity...truly a consummate Professional ! 5+ Star recommendation"
Generator repair
Generator repair
Generator repair
Generator repair
Generator repair

+27

Response time9 hrs
Recommended by100%of homeowners
Avatar for Mister Sparky
Mister Sparky
5.0(
7
)
Portable Generator - Install

Serving Holbrook, NY and surrounding areas

Approved

Free estimates

Credit card accepted

"All I can say is WOW, what a team! Brooks and Patrick spent the whole day yesterday, in my home, doing electrical upgrades and repairs including: Dusk to Dawn lighting, High Hats, Motion lights, New GFI outlets etc. They worked non-stop, refused multiple offers for food and drink, and completed each job to perfection. It was quite impressive watching them problem solve and rectify any issue they came across with the old wiring. When everything was completed, they walked me around the house making sure I was satisfied with all the work. Very satisfied I am, and highly recommend this team. You're gonna love them!"
Gallery
86 neighbors recently requested a quote
Avatar for R.C.K. Electric, Inc.
R.C.K. Electric, Inc.
4.3(
19
)
Portable Generator - Install

Serving Holbrook, NY and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"Ryan Did an excellent job. Installed a light fixture and a driveway motion light. He came on time and did the job very professionally. I would use RCK again the next time I need any electric work."
Response time5 hrs
Recommended by93%of homeowners
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Generator Install questions, answered by experts

Whole-house generators can run continuously for extended periods, even for weeks at a time (around 400 to 500 hours), as long as they have a sufficient fuel supply. However, this type of extensive use will increase wear and tear and can shorten the generator's overall lifespan. During long periods of operation, it's important to check and refill the engine oil as needed, potentially as frequently as daily depending on the model. If your generator uses a fuel tank, ensure it is kept full to prevent unexpected shutdowns.

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

Sizing a generator is a careful process that requires calculating the electrical load of your entire house. You have to take into account every device you want to use and their wattage requirements, plus the wattage needed to start them, and look for a generator that can safely run all that at around 80% capacity.

In more practical terms, a small home can run on a 10,000-watt generator (and if you only want to power a few key appliances, much less than that). A mid-sized home may need something between 15,000 and 22,000 watts. Larger homes require 25,000 watts or more. 

In most municipalities, you will need a permit to install a permanent home generator, including emergency backup, partial-home, and whole-home generators. A permit for a generator usually costs between $50 and $250, depending on where you live. Your electrician or certified generator installer will usually pull the permit for you—and might be required to do so by your building department—but you’ll be on the hook for the cost of the permit. You should ask your installer before agreeing to any work if they will pull the necessary permits for your project.

Costs depend on generator type, labor, and additional wiring or transfer switch requirements.

The Holbrook, NY homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.